Home / 129,702.21-178,988.76-72,341.61

Finding the Fourth Proportional to 129,702.21, 178,988.76 and 72,341.61

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Solution

The fourth proportional to 129,702.21, 178,988.76 and 72,341.61 is: 99,831.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,702.21 : 178,988.76 = 72,341.61 : x
  2. Step 2: Convert to fraction form
    129,702.21/178,988.76 = 72,341.61/x
  3. Step 3: Cross multiply
    129,702.21x = 178,988.76 × 72,341.61
  4. Step 4: Simplify right side
    129,702.21x = 12,948,335,070.30
  5. Step 5: Solve for x
    x = 12,948,335,070.30/129,702.21
  6. Step 6: Final answer
    x = 99,831.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.